Topic Contents

PMM2-CDG

National Organization for Rare Disorders, Inc.

ImportantIt is possible that the main title of the report PMM2-CDG is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Synonyms

carbohydrate-deficient glycoprotein syndrome, type Ia

congenital disorder of glycosylation type Ia

CDG1A

CDGS Type Ia

Jaeken syndrome

Disorder Subdivisions

None

General Discussion

Summary PMM2-CDG, formerly known as congenital disorder of glycosylation type 1a, is a rare multisystem disorder that involves a normal, but complex, chemical process known as glycosylation. Glycosylation is the process by which sugar chains (glycans) are created, altered and chemically attached to certain proteins or fats (lipids). When these sugar molecules are attached to proteins, they form glycoproteins. Glycoproteins have varied important functions within the body and are essential for the normal growth and function of numerous tissues and organs. PMM2-CDG can affect virtually any part of the body, although most cases usually have an important neurological component. PMM2-CDG is associated with a broad and highly variable range of symptoms and can vary in severity from mild cases to severe, disabling or life-threatening cases. Most cases are apparent in infancy. PMM2-CDG is caused by mutations of the phosphomannomutase-2 (PMM2) gene and is inherited as an autosomal recessive condition.

Introduction PMM2-CDG belongs to a group of disorders known as the congenital disorders of glycosylation (CDG). CDG were first reported in the medical literature in 1980 by Dr. Jaak Jaeken, et al. More than 50 different forms of CDG have been reported in the ensuing years. PMM2-CDG is the most common form. Several different names have been used to describe these disorders including carbohydrate-deficient glycoprotein syndromes. Recently, researchers have proposed a classification system that names each subtype by the official abbreviation of its defective gene followed by a dash and CDG. Congenital disorder of glycosylation type 1a is now known as PMM2-CDG. CDG are a rapidly growing disease family and information about these disorders is constantly changing.

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

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